These are in two separate pieces. ¹⁾
The scraper peels the oil off the flywheels and sends it down under the windage tray.
The windage tray isolates the oil under the flywheels so that windage from the flywheels doesn't kick it back up again.

The back end of the windage tray, where it meets the case and the scraper, has some half-moon style cutouts to allow scraped oil to go past.
The front of the windage tray attaches to the factory windage barrier.
It's basically an extension of the factory windage control.

The scraper needs to be .010“ to .020” from the flywheels to work properly.
The main thing is getting it all to fit, such that it works properly and the cases can be bolted back together without interference.
Takes a little trial and error, bending, filing, checking, repeat.

XL engine flywheel scraper 2)